Description of problem:
libmng links against lcms which has just been blocked from rhel-7. lcms is an old and unmaintained library with known security problems. Programs should link against the newer and maintained lcms2 that has minor API changes.
Given that the security bugs are exploitable, and libmng can open random images from the internet (and dragged onto the DVD by Qt) I think that this bug is quite important to fix.
See https://engineering.redhat.com/rt/Ticket/Display.html?id=199807 for ticket.

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